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CHAPTER 7 CATALOG ADMINISTRATION
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Catalog::SetImage($this->mProductId, $_FILES['ImageUpload']['name']); } // If the error code is 0, the second file was uploaded ok if ($_FILES['ThumbnailUpload']['error'] == 0) { // Move the uploaded file to the product_images folder move_uploaded_file($_FILES['ThumbnailUpload']['tmp_name'], SITE_ROOT . '/product_images/' . $_FILES['ThumbnailUpload']['name']); // Update the product's information in the database Catalog::SetThumbnail($this->mProductId, $_FILES['ThumbnailUpload']['name']); } } The $_FILES superglobal variable is a two-dimensional array that stores information about your uploaded file (or files). If the $_FILES['ImageUpload']['error'] variable is set to 0, then the main image of the product has uploaded successfully and must be handled. The $_FILES['ImageUpload']['tmp_name'] variable stores the temporary file name of the uploaded file on the server, and the $_FILES['ImageUpload']['name'] variable stores the name of the file as specified when uploaded to the server.
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Note A complete description of the $_FILES superglobal is available at http://www.php.net/
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manual/en/features.file-upload.php.
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The move_uploaded_file PHP function is used to move the file from the temporary location to the product_images folder: /* Use the move_uploaded_file PHP function to move the file from its temporary location to the product_images folder */ move_uploaded_file($_FILES['ImageUpload']['tmp_name'], SITE_ROOT . '/product_images/' . $_FILES['ImageUpload']['name']); After uploading a product picture, the file name must be stored in the database (otherwise, the file upload has no effect): // Update the product's information in the database Catalog::SetImage($this->mProductId, $_FILES['ImageUpload']['name']); As you can see, it s pretty simple to handle file uploads with PHP.
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CHAPTER 7 CATALOG ADMINISTRATION
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Implementing the Business Tier
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To implement the business tier, you ll need to add the following methods to the Catalog class: DeleteProduct completely removes a product from the catalog. RemoveProductFromCategory is called when the Remove from category button is clicked to unassign the product from a category. GetCategories returns all the categories from our catalog. GetProductInfo returns the product details. GetCategoriesForProduct is used to get the list of categories that are related to the specified product. SetProductDisplayOption sets the product s display setting. AssignProductToCategory assigns a product to a category. MoveProductToCategory moves a product from one category to another. SetImage changes the image file name in the database for a certain product. SetThumbnail changes the second image file name for a certain product.
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Exercise: Implementing the Business Tier Methods
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Because the functionality is better expressed by the data tier functions the methods call, we ll discuss more about them when implementing the data tier. Add the following code to the Catalog class inside of business/catalog.php: // Removes a product from the product catalog public static function DeleteProduct($productId) { // Build the SQL query $sql = 'SELECT catalog_delete_product(:product_id);'; // Build the parameters array $params = array (':product_id' => $productId); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query return DatabaseHandler::Execute($result, $params); } // Unassigns a product from a category public static function RemoveProductFromCategory($productId, $categoryId) {
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CHAPTER 7 CATALOG ADMINISTRATION
// Build the SQL query $sql = 'SELECT catalog_remove_product_from_category( :product_id, :category_id);'; // Build the parameters array $params = array (':product_id' => $productId, ':category_id' => $categoryId); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query and return the results return DatabaseHandler::GetOne($result, $params); } // Retrieves the list of categories a product belongs to public static function GetCategories() { // Build the SQL query $sql = 'SELECT * FROM catalog_get_categories();'; // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query and return the results return DatabaseHandler::GetAll($result); } // Retrieves product info public static function GetProductInfo($productId) { // Build the SQL query $sql = 'SELECT * FROM catalog_get_product_info(:product_id);'; // Build the parameters array $params = array (':product_id' => $productId); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query and return the results return DatabaseHandler::GetRow($result, $params); } // Retrieves the list of categories a product belongs to public static function GetCategoriesForProduct($productId) { // Build the SQL query $sql = 'SELECT * FROM catalog_get_categories_for_product(:product_id);'; // Build the parameters array $params = array (':product_id' => $productId); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql);
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